Blank Picture, Sound OK on Sony TV

My 7 year old trinitron, KV-27v22, working great until recently, no longer produces a picture when first turned on. With time and patience we can get the picture on sometimes, but until then we get a blank screen or a picture that flashes or is distorted. Sometimes the red light flashes while the picture is not on, so I assume this may be a power problem. BTW, in the past, sometimes the set was turned off by flicking the main power to the room (a light switch) off rather than turning the set off first. Don't know if this may be a factor.
Thanks
Pete

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It must be connected with the color circuit of your tv, a board connected to back end of the tube. Could be dust, cob web or carbon deposit shorting a transistor. Popping noise if loud enough can be attributed to high voltage circuit fault and picture tube.

dear, you can check that transformers out put before connecting to a tv. also when its connected to a tv.
get a avo meter and connect in series with a tv.
observe the current on the intial switch on and when the picture goes. if you notice that current on intial switching is high and then it starts going lower and lower, then change the transformer.
but if the current starts going up from the intial current then check the power supply components of the tv.
thanks for asking fixya.